I've been thinking about this one for a while.
Perhaps an empty game console case, the newer the best, for shock value. "Hey that guy just threw a freakin PS3 in the lake..........oh wait!!!
a catamaran made out of empty beer cans, it must go very fast
Just had an idea, why dont we have a little contest? this could be fun....I'm sure there's enough of us here, that have everything needed to make something, without spending a dime. I'll have to think about that some more, dont be surprised to see another thread.